Multiple-ratio transformer.



No. 879,252. PA'I'BNTED FEB. 18, 1908.

" v C. LE G. FORTESCUE. l

MULTIPLE RATIO TRANSPORMER. AP'PLIvoATI'oN FILED JUNI: 8.1907.

2 SHEETS-SHEET 1.

l 431543 UVM 3? 31- 27 -za sa r Zw .VV VI HV TVI Vgl-Vfl f f1 l l ,Z4/ 34@ Gr.35 LZ5 24.45 34p `@33 'Z5 ZIA/ O O 5' 35 .50o 52.9 M3 .am3 629" 35 41 3.5. o 40,0-9-41 o o #4f 38@ @69 @w44 h o o MMM/ 43 39 as V o o Z4/l o o gilt) o` o .LVZ-5 30 9 30 gg 30 a9 35 41 35 I I 4u. o o o f o o o o 45u/ agi- 4 0 X144 a0-@a9 k1# wmassis'; xNvENToR I xM/ MMA-5am 3v BY- f ATTORNEY No. 879,252. PATENTBD FEB. 18, 1908.

C. LE G. FORTESGUE.'

MULTIPLE'RATIO TRANSFORMER.

' APPLICATION FILED JUNI: 8.1907,

2 SHEETS-SHEET 2A l 34 o o 3.5 24 o o *Z5 Kg@ 2.9 Y10 26g/,

f 35 35 gig/47 l/lx l o 045i) O O 3.9 o 38 o o 44 3(9-0-9/39 wel 44 Eig/z my@ VWITNESSES: iNVENTOR m8 @MJ I f ATTORNEY UNITED srArEs PArItNr""OPIiIon9 CHARLES Ln e. FoRfrEsCUE, OP, wILIrINsBURe', PENNSYLVANIA, AssI'GNO'It 'To WESTINGHOUSE Anmsornro a MANUFACTURING COMPANY, A CORPORATION or PENNsYLvANIAj I f Ne.' #9,252. specification ef Lettere Patent) Patented reb. 18,11908 f l i lApplication.filedl'\1ne 8 l9()f 'SerialNh-.S'fll'r I s" lll. i Tp dZZwtoyrt'it concern: I l ment-of the' windings is'alsO-not mat/,11 S

-Be 1t known that I, QIIARLES La GL'LFO'R- disturbed, so. that there is .little ordno'yt T;ESCUE, a subject of the of Great Briteney toward unbalaneing of the" am, and a. resident of Wilkinsbur l, in the corresponding portions of the mag,

'5 county of Allegheny and State. of ennsyh MULTIPLE-RATIO rRANsFoRMn'n-.

van'ia, haveinv'ented anew and useful lin-f .proveme'nt in Multiple-Ratio Transformers', of which the following isa speeiieation.

My invention relates toeleetriealtr'ansrange the Winding of a transformerand the 'connection thereof as to providefor a large number ofratios between the voltages ofthe .v primary and secondary windings, and so that l15 adjustment of the Vvoltage ratio may beeffeoted lWithout unbalaneing the .magnetie Circuits, .or materially,affecting.l the indue--` :tance and the power faetor of the trans-4 forrnen 2o In .eieetneei trenefeniers'git ie desirable that-the primary and seeondarywindings be 'sodisposedwith referenee'to eaeh'othe'r andsubstantial neutralization of the .25fluqr'eseorresponding thereto, and, to this t,`e n d ,.th e -windings are usuallydividf i into la plurality of sections that are' interpolated n v4close .together-in a symmetrical arrangement.

Also, in order that avariety of voltagesinayT` 30, lbe. o,btai ned frc n i ftl 1e same transformer, thel Windings are,A usually provided'with a 'g lui-ai- ,ity ofleadsgrhereb'ythe active lengths -there- Of 1nay bei adjusted, but, as transformers .have .been constructed heretofore, the leads 35 have been Connected tothe windings atsuch tive. portions'of the windings h'as sometimes been interfered with also, when effecting voltage adjustment and. a relatively large t0 Obtain a large variety of voltages'. In the A present transformer, however, .the leads are l y sofa'rranged that'the distaneesbetweenthe active portions offthe respective windings 50.remain constantl vh'er'ij vremoving portions thereof. for the {purp'bse of effecting voltage adjustnient,` fso "'t' the induetane'e of the transformer m "f for--allv he' synnne,trie alA arrange- '45 number ofsleads has been necessary-inorder s substantially the' same Cuit, and a large number of voltagesniaybe obtained by I4employing a relatively mall number of leads. i

Figure l, ofthe accompanying. ra

is a diagranrmatie'viow of a portion `f former that 'embodies my invention, Figs. 2 to ll, inclusive,a re diagramnatie 65 views illustrating themodes of connecting .the windings to obtain a plurality of voltage Ijatiosinthe transforn1er. j

. In Fig. 1, a portion of the core or "magnetie 'Circuit l o f a transformer is provided witha' 70 plurality of coils 2 to 21, inclusive, coils 2,' 8 15, and 21 oonstituting as manysectior'is O f the low voltagewinding of the'transforniei", andv therenaining coils being divided int-'o threeJgroups constitutingtlir'ee sections 'of 75 the high voltage winding'. It will'beob'- served that ea'eh of the two outer'seetiohs of 'the high voltage -windings "compris'esve -oils While the vmiddle' group Coin rise'sfsii'r oils, and th'at the interpolation o 'the Seel 80 tion belonging to the respeetivewiiiding's is such as to form a symmetrical arrangement in order to insure, as far as plossiblefa balance of the fluxesin corresponding portions'of the magnetic Circuit. The extremities -of 'the .85 high voltage windingare eonneetedyres'peotively, by means o'f leads22 and 23,5130 tern1i+ nals24 and 25 u on a terminal' board-or liloek'26, theterminals 24 and 2 5 beingfe'onf suitable external eiiieuit not shownhsT-he high voltage winding Cornprises'twopalrtslof equal length that maybe Connected--eithrin series-or parallel arrangement, the nn'erfex; trernities :27"ad 28 i. e., the 1 ter-mitrailsrof the coils 1land=12, being e0nneeted ,:respe li' tively, to terminals 29 and 8001i t-h-ftermi- I nal block 26.;y --i In order to provide Vmeans for e'e'fing'jad# j ustmentf the voltage of the winding, suit'- 100 able points inthe. 'coils4 10 and lnder-Orlnected, respectively, by rueansof-'lead 331 and 32 to terminals 33 and upon the'terjininal board'L-. For this purpo'se,falso,-en treini'ties o fthe coils and 6 areeomiected, respectively, to terminals 35-andf3G:,u1lGIlii1 auxiliary terminal block 37, midgi'sfuitable points ofthe said'eoils areconnecltedyrilespeeminals-43 and 44 u on theterminal block 42.

In order. to un erstand Athe operation of the invention'reference should be, had to lo Figs. 2 to 18, inclusive, in which are illustrated the connections of the leads'to the high voltage Winding'for obtaining a variety vof voltages.

In Fi 2 terminals 29 and 30 are connect ed toget er, also, as are terminals 35 and 36,' and terminals 40 and 41, all of the high voltage 'winding beinuthen in series andthe vo tage of the Win g being the highest obtainable.

InFig. 3, the connections remain the same exce t that terminal35is connected to termin 39 instead of to terminalf36, a section. of the coil 6 being thereby removed from the circuit and the Avoltage of the Winding being 4corres ondingly reduced. In 4 terminal 41 is connected to terminal 43, the connections :otherwise remainthe same 'as in Fig. 3. A ortion of the f coils 17 'is thenfexcluded from t e circuit and the voltage of:the winding spondingly reduced. A ,I In Fi 5; terminals `36 and 38 are connected to et er, the remaining connections being as in 4', and a section of each o-coils 5 and 17 .being thus removed from circuit. It will then be seen from Fig. 1l thatthe portion vof the coil5 Arincluded between terminals -35' and`38 is of greater length than the portion ,of the coil 6 included between terminals 36 and 39, and that the portion of the eoil '18 included between terminals- 41 and 44 is of greater length than the portion of the coil 17 included between terminals -and 43. In order that successive steps 'inovoltage may -18 .that mayr be removed from circuit should be', respectively,- of twice 'the active length of the parts of the coils-6 andl' that may be removed fronithe circuit. Thus, it will be understood that with' the connections of Fig. 5, a lower voltage is obtained than with t'he connections of Fig. 4.- In Fig. 6 por! ions of the coils 5 and 18 are excluded from the circuit since terminals 40 and 44 are connected together, and 1n Fi s. 7 and 8 portions of the coils 6 and 17 are a o res ectively excluded from thepircugit, since, in ig. 7, terminals 38 and1 39. are connected f together while, in Fig. 8,' terminals 4 3 and 44 so are connected together, 'corresponding reductions in the voltage being' thus effected. l In Fig. 9 terminals 30 and 33 upon the terminal block 26 are connected together, as are alsoterminals 38 and 39 upon the block 37, and terminals 4U" and 44 upon the block is again corre-A be provided, the portions of the* coils 5' and' 42,' portions of the coils, 6, 10, and 18 and all of the' coil llbeing' thereby excluded 'from thecilcuit. Another reduction in the voltage equal to' the previous .reductionswill thus occur if the portion ofthe winding in-'70 cluded between terminals 29 and 33 is equal to the portion of the coil 5 that is included between the terminals 35 and 38. 'For a like reason, the portion of the winding included between terminals 30 and 34 should also be 75 equal to the portion of the coil 5 included between terminals 35 and 88.

'In Fig. 10, a portion of the coil 17 is excluded from the circuit, inFig.' 11, ortions of the coils 5,6, 10, 13, and 18 and a of coils 80 11 and v12 are excluded from the-circuit, and 1n Fig. 12, a portion* of the coil 17 is excluded from the circuit,- equal reductions in'the volage being thus effected. Y

In Fig.- 13, terminals 24, and 30 arecon` g5 nected together as are also terminals-25 and 29, terminals '35 and 36', and. terminals 4() v and 41', theportions of the winding. included,

respectively, between terminals 24 and 29' and between terminals 25 and 30 being thus 90.

connectedin parallel relation. In F ig.""14,' the -'sections of the windin s6- and 17 A1areremoved from the circuit, vin 15,' sections 5 and 18 are removed from'the y circuit, and in Fig. 16', portions'-f each of 9'5 coils 5,6, 17, and 18 are removed from the circuit, corresponding e ual '-reductions'iin'f the voltage being effected` ythe connections re resented by the respective figures'.

4n Fig. 17,' sections. ofeach of coils 5, 10, 100 13, and y18 and all of coilslland 12 vare'removed from' the circuit,while, in Fig. 18, prortions of coils 6 and 17 'are also removed om the circuit. It should be'noted that the leads, whereby '1.05 portions 'of the high voltage winding are removed from the circuit in order to effect adjustinent o'f the voltage of the transformer, are connected ator near the middle points of the three sections of. the hi h voltage winding, and to the coils that are located ap'- fproximately midway between the co'ilsor sections ofthe low voltage windings.' r'*Thus,' the portions of the high voltage that are removed from the circuit when e 115 .feeting voltageadjustment are located v farthest from the coils of the other winding and, consequently, in the'weakestleakage The 1n uc- 125 i primary andsecondary windings comprising a plurality of sections, the sections of each numberof leads'than in previous arrange- I -ments of the connections.

`I claim as my invention;

1.` In a transformer, the combination with winding belng 4interpolated with thoseof the other in a symmetrical arrangement, of means for removing portions of the sections of one winding'that are located inthe weakest leakage magnetic field of the other wind-- ing.

2. In a transformer, the combination wlth primary and secondary windings comprising a' plurahty of sectionsythe sections yof each winding being interpolated with those of the other in-a symmetrical arrangement, of means for removing from the circuit vportions i of thesections of one of the' Windmgsthat are locatedv approximatelyl midway Abetween the sections of the other windings.

3*. In a transformer, the combination with primary and secondary windings, ofjmeansl of alfportion of located' in' the.

meansv for adjusting the,

portion of the latter Asubscribed my 5. In a transformer, the combination with a winding comprising a plurality of sections', a d another winding located between the sections thereof, ofy a nected to that ortion of the latter winding which is located approximately midway `bvetween the sections of the former, and means for. connecting different pairs of said leads to adjust the Voltage ratio of the transformer.

a Winding comprising a plurality of sections, and another nected to that portion of the latter winding whichis located in the weakest leakage magneticeld between the sections'of the .former winding, and means for connecting different vpairsof said leads to adjust the voltage-ratio of the transformer. v. y 7. Ina transformer, the combination with a Winding comprising! a plurality of sections,

and anotherl winding located between the sections thereof, yof means ',for adjusting the active len th of that portion ofthe latter winding which occupies the weakest leakage .magnetic 'field' between the sections ofthe former. f

plurality of leads con-"'- -v '6. lIn atransformer, the combination with I winding located between the sections thereof, of a plurality of leads con- In testimony4 whereof,A I have hereunto name this 31st day of May, 1907., n CHARLES IIE G. FORTESCUE; itnesses: l

O'r'ro S. SCHAIRER,

BIRNEY HINES. 

